I don't think our forum downloads area is really the most practical or suitable place for a fairly huge collection of unfinished music.
As I've said in the past, we're not really offering this as a personal backup service where you can dump your life's work, it's mainly intended to show off some selected items of interest.
Instead, I think a place like https://archive.org
may be better suited to the task, but I'm not sure of their exact submission policy when it comes to unfinished or technically "unpublished" material.
They have a Community Audio
section which seems pretty laid back, and I know that user "EatMe" from this forum has submitted his music there in the past.
If you take care to prepare and bundle all the files into some kind of basic package with a bit of info about yourself, I'm sure it would be fine to submit it there.